These do slow down as temps rise to prevent burnout. You didn't tell much about this model so I can't see if prior suggestions would apply.
Let's guess this is a new laptop. Why not make it a warranty or reason to get a refund?
i have a laptop on which the games runs smoothly when laptop temp is normal, but when the temp increases the games began to run at low fps and even lowering the settings of graphics doesnt work. PLease help....